Grinding apparatus



Jan. 7, 1958 M. A. JENNINGS ETAL 2,818,689 GRINDING APPARATUS Filed Julyso, 1956 1 s Sheets-Sheet 1 FIG.

4 INVENTORS MELVIN A. JENNINGS WESLEY JENNINGS BY V w ATTORNEYS 3She'ets-Sheet 2 I l l NN v N o .1. m m MIN #T HM 8 4 ,4 NW;

INVENTORS MELVIN A. JENNINGS WESLEY JENNINGS any/52w.

Jan; 7, 1958 M. A. JENNINGS ET AL GRINDING APPARATUS Filed July 30, 1956ATTOBbLYS Jan. 7, 1958 M. A. JENNINGS ET AL 2,818,689

GRINDING APPARATUS 5 Sheets-Sheet 3 Filed July 30, 1956 INVENTORS BY WESLEY JENNINGS ATTORNEYS MELVIN A. JENNINGS '7 has! GRlNDlNG APPARATUSMelvin A. Jennings, Vassar, and Wesley Jennings, Royal Oak, Mich.

Application July 30, 1956, Serial No. 600,777

18 Claims. (Cl. 51103) This invention relates to apparatus for use inconjunction with a grinding wheel and has for one of its primary objectsthe provision of means for presenting a workpiece to a grinding wheel,turning the workpiece relatively to the grinding wheel about the axis ofthe workpiece so that the entire surface of the workpiece adjacent tothe grinding wheel is traversed by the grinding surface, and dischargingthe workpiece from the apparatus after completion of the grinding stage,all of the foregoing operations being accomplished automatically.

Another object of the invention isto provide apparatus of the kindreferred to which includes yieldable frictional means for yieldablyholding a workpiece against the grinding wheel and for simultaneouslyturning the workpiece relatively to the grinding surface.

Another object of the invention is to provide apparatus of the kinddescribed which is adjustable so as to be capable of use with workpiecesof varying size.

A further object of the invention is to provide such apparatus as hasbeen described which is capable of presenting a workpiece to thegrinding wheel at different positions relative to the latter so as topromote even wear of the grinding surface.

A further object of the invention is to provide automatically operablemeans for initiating the grinding of a workpiece and for automaticallydischarging a finished workpiece.

Other objects of the invention will be described in detail or willbecome apparent from the following description of the invention whenread in conjunction with the appended claims and the accompanyingdrawings, in which:

Figure 1 is a side elevation of apparatus constructed in accordance withthe invention;

Figure 2 is a top plan view on an enlarged scale of a portion of theapparatus shown in Figure 1;

Figure 3 is a sectional view taken on the line 3-3 of Figure 2; and

Figure 4 is a fragmentary plan view diagrammatically illustrating amodification of a portion of the apparatus.

Apparatus constructed in accordance with the invention comprises a frame1 having supporting legs 2 on which is mounted a bed or upper plate 3.In the disclosed embodiment of the invention, the frame includesforwardly projecting arms 4 which may be secured by bolts 4a or the liketo the supporting structure 5 of a grinding wheel 6 which is mounted forrotation about the axis of a horizontal shaft 7, the grinding wheelbeing shielded by a suitable hood 6a. Alternatively, the grinding wheeland its driving motor (not shown) may be mounted on the same frameworkthat supports the remaining parts of the apparatus.

On the bed 3 is rigidly secured a base member 8 and slidably mounted onthe base 8 is a lower guide plate 9 provided with an upwardly projectingdovetail 10 which extends laterally of the plate 9, i. e., parallel tothe shaft 7 on which the grinding wheel 6 is mounted. Mounted forsliding movement on the lower guide plate 9 is an intermediate guideplate 11 which is provided in its under side with a recess or guideway12 for reception of the dovetail 10. The upper surface of theintermediate guide plate 11 is provided with a dovetail slot 13 whichextends fore and aft of the plate, and the slot 13 receives a matingdovetail 14 formed on the lower surface of an upper guide plate 15. Thebed plate 8 is provided with an upstanding part 16 in which is rotatablyjournalled a shaft 17, the forward part of which is threaded as at 18and extends through an upstanding part 19 provided with a threadedopening and formed at the rear end of the lower guide plate 9. The shaft17 is equipped with a handwheel 20 which may be rotated manually so asto cause corresponding rotation of the screw-threaded shaft 17, therebyenabling the position of the lower guide plate 9 to be adjustedrelatively to the base 8. The lower guide plate 9 also is equipped withan upstanding part 21 which journals a threaded shaft 22 received in athreaded opening in a part 23 formed at one side of the intermediateguide plate 11. A hand wheel 24 is mounted on the free end of the shaft22 so as to facilitate turning of the shaft and adjustment of theintermediate guide plate 11 laterally relative to the lower guide plate9. Similar apparatus comprising an upstanding part 25 on theintermediate guide plate 11, a screw threaded shaft 26 received in athreaded opening in the upper guide plate 15, and a handwheel 27 on theshaft 26, is provided for adjusting the upper guide plate 15longitudinally relatively to the intermediate guide plate 11.

At the forward end of the frame work supporting means generallydesignated 28 is provided for supporting a workpiece in a position to beengaged by the grinding wheel 6. In the embodiment of the inventiondisclosed in Figures 1-3, the work supporting means comprises a workrest 29 including a blade 30 removably held in a slotted holder 31 by aset screw 32, the holder 31 being secured to the forward part of theintermediate guide plate 11 by suitable means such as bolts 33. The worksupporting means also includes a pair of guide rollers 34 and 35 mountedon the intermediate guide plate 11 by means of journal bearings 36 and37, brackets 38 and 39, and bolts 48 and 41, and about which more willbe said subsequently. Also mounted on the forward end of theintermediate guide plate 11, but at a position spaced from the worksupporting means 28, is a work receiving member or platform 42, theplatform being supported at a height corresponding to the height of thework rest blade 30 by a bracket having a vertical leg 43 fixed to theunder side of the platform 42 and having a slotted horizontal leg 44adjustably secured to the guide plate 11 by a bolt 45.

The invention includes a work handling member 46 operable to receive aworkpiece from the platform 42 and transfer it to the work supportingmeans 28 and assist the latter in supporting the workpiece in grindingposition. As disclosed in Figures 1-3, the work handling membercomprises a plurality of disc-like plates 47, 48 and 49 which are heldin vertically spaced relation at their centers by hubs 5t) and 51 formedon the plates 48 and 49, respectively. Each of the plates is providedwith a central opening for the reception of the enlarged upper end of ashaft 52 which is journalled for rotation in upper and lower bearings53, 54, respectively, carried by a sleeve 55. The sleeve 55 extendsthrough a circular opening A formed in the upper guide plate 15, througha forwardly and rearwardly extending slot B formed in the intermediateguide, plate 11, through a laterally extending slot C formed in thelower guide plate 9, through a forwardly and rearwardly extending slot Dformed in the base 8, and through a forwardly and rearwardly extendingslot E formed in the frame top 3 at its forward end. At its upper endthe sleeve 55 is provided with a radially extending flange 56 whichrests on the upper guide plate and is secured to the latter by means ofscrews 57, and at its lower end the sleeve is securedby s'c'rews'58 to aplate 59 whichis centrally bored as at; 60 to provide a passage throughwhich the shaft 52' extends. At the periphery of 'the plate 59 is aplurality of threaded openings into each of which-is threaded the upperend of a rod 61, the intermediate portions of the latter passing throughaligned'threaded openings formed inilpper and lower plates 62 and 63,respectively, which support a gear reduction housing or fluid couplingtransmission device 64, and the lower. ends of the threaded tie rods .61aretreceived in a plate65 to which is secured an electri motor, 66having means'(not shown) to connectwit' to apower source. The positionsof the several partsmay be adjusted and secured by-nuts 61a on thetierodsi61. .The motor armature 67 isconnected to the input shaft 68. ofthe transmission device 64 by a coupling 67-of knownconstruction and theoutput shaft '70 of thedevice 64 is connected to the shaft 52 byasimilar coupling 71.

I :In order toprovide a positive drive transmitting connection from thevshaft-52 to the work handling member 46, a metal bar 72 having acentrally located sleeve =73 is positionedon the upper end of the shaft52- and is keyed to the latter by a pin 74 which passes through alignedopenings formedin the sleeve 73 and in the shaft 52. The-:bar72 is keyedto the driving member '46 by'means ofpins 75 which pass through openingsformed ineach of the three'disc-lik-e parts 47, 48 and 49 and which areheld infixed relation with respect thereto by means of nuts 76 threadedonto the reduced threaded vends .of thezpins.

'The arrangement of the parts described thus far is such that the lowerguide plate 9 may be adjustedtfon wardly or rearwardly relatively to thebase 8 and the frame 3. so as to position the work supporting means 29the desired distance from the grinding wheel '6. The

intermediate guide plate 11 then may be adjusted laterally relatively tothe parts belowit so as to adjust the. axis of rotation of the member 46relatively to the center line of the grinding wheel. Then the upperguide plate '15 may be forwardly or rearwardly adjustedrelatively to theparts below it so as to vary the distance from the peripheral edge ofthe member 46 to the work supporting means 29. ,It will be understoodthat the motor 66 audits associatedparts, including the shaft 52, willmove whenever the upper guide plate is caused to move, whether movementof'the latter is caused by operation of its associated adjusting means25, 26, 27 or by adjustment of one or both of the guide plates 9 and 11,but in either event such movement of the motor and parts will bepermitted withoutinterference because of the provision of the slots B,C, D, and E in those parts of the apparatus located below the guideplate 15.

As is'best shown in'Figure 2,not'all of the diameters of-the platesforming the work handling member 46 are the same. The lowermost plate 49is the largest in diameterandits periphery provides a ledge or part 77projecting radially beyond the other twoplates so as to provide. asupport for a workpiece in a manner yet to be described. Between theupper plate 47 and the lower P1316'49.18.I1d extending around theperiphery of the intermediate plate 48 is a yieldable strip 78 of rubberor the like materiaL'the strip being doubled over at its centertopresent'a smooth surface and having its upper edge received betweenthe discs 47 and 48 and its lower edge rec'eivedbetween the dis-cs 48and 49. The edges of the strip are removably clamped in position betweenthe plates 47 and 49 by means of bolts 49a which pass through alignedopenings in the discs and in the doubledover strip, the bolts havingnuts 58a on their lower ends.

In assembledcondition, the strip 78 provides a .yield v able peripheraledge for the plate 48 which may be radially inwardly depressed for apurpose to be explained.

As is best shown in Figure 2, the upper disc-like plate 47 of the workhandling member 46 is cut away at least at one and preferably at twoplaces along its periphery as at 79, and the rubber-like strip 78 issimilarly cutaway as at 80 so as to provide at leastone and preferablytwo diametrically opposed workpiece receiving openings 81 in the workhandling member and which are rotatable with the member 46 from a workloading station opposite the receiving platform 42 to a work grindingstation opposite the grinding wheel 6 and return. The lower disc-likeplate 49 also is provided with a number of Cut outs or interruptions 82corresponding to the number of work receiving openings 81, but in eachinstance the interruption 82 is angularly spaced ahead of the adjacentopening 81 in the direction of rotation of the member 46.

Means is provided for loading the work handling member automatic-allyand in the disclosed embodiment comprises a lever arm 83, having a camsurface 84 thereon fixed to the lower end of a collar 85 which ismounted on a post86, the latter being secured to the upper guide plate15. The arm 83 extends towards the rear of the apparatus and normally isbiased by a spring 87 towards a position at one side of the apparatus soas to locate the cam surface 84 in the path of a cam 88 fixed to theunderside of the lowermost plate 49 of the work handling member 46.Also'secured to the collar 85, but at the upper end thereof, is. an arm89 which lies atop the load ing platform 42vand has its forward endcurved as at 90 so as partially to embrace a workpiece located on theplatform in a position corresponding to the chain line showingdesignated W-1 in Figure 2.

In the operation ofthe apparatus, the work supporting means 28 and thework handling member 46 may be adjusted relatively to the grinding wheelin the manner previously described so as to condition the apparatus foruse with an annular or disc-like casting or workpiece W such as isdisclosed in the drawings. The grinding wheel 6 will be caused torevolve in the direction of the arrow a (Figure 1) and the motor 66 willbe started so as to rotate the work handling member in the direction ofthe arrow b in Figure 2. A workpiece W will be placed on the loadingplatform 42 at the position marked W-l and as one orthe other ofthe workreceiving openings 81 comes opposite'the platform 42, the correspondingcam 88 will engage the carnsurface 84 on the lever arm 83 causingbothof' the lever arms 83 and 90 to be rocked clockwise, as is viewed inFigure 2. Clockwise rocking of the-lever arm 90 will push the workpieceW from the W1 position towards the work handling member 46, i. e., tothe position shown by chain lines and markedW-2, and the movements ofthe parts will be so timed that the workpiece W will be pushed into oneof the openings 81 whereupon continued rotation of the member '46 willcause'that part of the yieldable strip 78 angularly rearwardly of andadjacent to the opening 81 to bear against the periphery of theworkpiece W and propel it off the platform 42. As the work handlingmember and the workpiece move clockwise, as viewed in Figure '2, theedge of the workpiece will engage the guide roller 34 and the yieldablestrip 78 will be radially depressed, but since the strip 78 is formed ofrubber or similar highfriction material, the workpiece will be rotatedabout the guide roller 34 until it is in a position to be movedforwardly under the force of the expansion of the depressed yieldablestrip'78, atwhich time it will occupy the space between the rollers 34and 35 in the position shown in full lines in Figure 2 and will have itsforward peripheral edge supported by the work rest 30. Throughoutthemovement of the work receiving opening 81 from the loading station tothe grinding station,.the workpiece W also will be supportedbythe'ledge'or part "77 of the member 46 and when the workpiece is in thegrinding position the part 77 will assist thework supporting means 7 29in supporting the workpiece.

to the grinding wheel, the former should be so spaced from the latterthat the peripheral edge of t he strip 78 v will remain in contact withthe workpiece. This assures that rotation of the work handlingmemberwill cause the workpiece to be rotated about'its own axis so as topresent its entire peripheral edge to the wheel and have all of thesnags or projections 91 (Figure 3) ground off. When a snag is presentedto the grinder, the workpiece may be thrust rearwardly as will bepermitted by the yieldability of the strip 78 so as not to require acomplete grinding otf of the snag in one pass. This arrangement promoteslonger life, for the grinding wheel and the grinding of the workpiece isnot adversely affected inasmuch as theworkpiece will be rotated a numberof revolutions about its own axis before it is discharged so as toassure that each snag will pass the grinding wheel a number of times.

81 approaches or is at the loading station, the notch 82 just ahead ofthat opening will pass under a workpiece at the grinding station so asto remove the support for the rear edge of the workpiece. At this timethe workpiece will up andslide 011 the work rest 30 and will fall awayby gravity through an opening F formed in the forward parts of the lowerand intermediate guide plates 9 and 11 and be received in a chute or thelike (not shown). Subsequent workpieces will be handled in the mannerjust described.

Eventually, the grinding wheel will wear to such an extent that it nolonger will ,grind 0E snags cleanly. At this point an adjustment may bemade of either or both of the guide plates 9 and 15 to compensate forthe Wear of the grindingwheel. If the center of the work handling memberremains on the center line of the grinding wheel so that the workpieceengages the grinding wheel tangentially at the center of the latter, thegrinding wheel soon would be worn to-a concave shape. To prevent thisfrom occurring, the work handling and supporting members may be adjustedlaterally by operation of the adjusting screw 22 to as to position thework handling member and the work supporting means 29 to one side or theother of the center line of the grinder.

line of the grinding wheel 6, so as to enable more even wear of thelatter to take place, but will not otherwise change the operation of theapparatus.

In Figure 4 there is shown an alternate arrangement which may be usedwhen the center lines of the work handling member and the grinding wheeldo not coincide. In this arrangement a loading platform 42a is ofsuflicient length to extend completely across the grinding wheel 6 so asto provide means for supporting the workpiece W at the grinding station.The work handling member 46a may consist of a single disc-like plate 49ahaving one or more work receiving openings 81a 7 therein, and acorresponding number of work discharging openings or recesses 82a, thereceiving and discharging openings being alternately located about theperiphery of the plate 49a. In the operation of the embodiment shown inFigure 4, a workpiece will be placed on the platform 42a in a positionto be engaged by loading means such as the arm 89, previously referredto, when the work receiving opening 81a is opposite the loading station,the loading arm acting to propel the workpiece into the opening 81a inthe manner previously described.

Continued rotation of the member 46a in the directionindicated by thearrow d will move the workpiece to the This adjust-. ment will locatethe workpiece laterally .of the center grinding position; shown inFigured. The position of the member 46a have been so adjusted relativelyto, the grinding wheel 6 that there is not suflicient cleargrindingwheel to allow the workpiece to pass the grinding wheel. Therefore, thepart 77a will assist the platform in supporting the workpiece by holdingthe latter against the grinding wheel and rotating it about its own axisduring the return movement of the opening 81a until such time as theinterruption 82a moves opposite the grinding station. The depth andconfiguration of the interruption 82a are such that the ground workpiecewill be received therein and carried past the grinding wheel to aposition where the workpiece may drop oh? the platform 42a. If desiredthe member 46a may be provided with a rubber or the like part, similarto the strip 78, to provide a high-friction edge surface for engagementwith the workpiece.

In'both forms of the invention, the construction and arrangement of theparts forming the work handling member are such that any one of aplurality of varying size members may be used and the substitution ofone member-for another may be accomplished quickly and simply. Referringto Figures 1-3, the disclosed work handling member 46 may be replaced byanother having more ,or less work receiving and discharging openings byremoving the pin 74 and lifting the member 46 oif the shaft 52. Then theintegral sleeve 74 and the bar 72 may be slipped .05 the pins 75'andplaced on similar pins of a similar work handling member which then maybe mounted on the shaft 52. The interchangeability of parts enables theapparatus to be used for grinding articles of greatly varying size.

The disclosed apparatus is representative of preferred forms of theinvention, but is intended as illustrative rather than definitive of theinvention. The invention is defined in the claims.

vWe claim:

1. Apparatus for use in conjunction with a rotary grinding wheelcomprising a workpiece handling member having a work receiving openingmovable in a substantially horizontal plane from a work loading stationto a work grinding station and return and having a work supporting partfor supporting a workpiece throughout the movement of said workreceiving opening from said work loading station to said work grindingstation; means for supporting a workpiece at the grinding station, saidwork supporting part assisting said work supporting means in supportinga workpiece at said grinding station, said work supporting part beinginterrupted for a portion of its length so that during a portion of thereturn movement of said work receiving opening a workpiece at saidgrinding station is unsupported by said part and may be removed fromsaid grinding station; and means for moving said member.

2. The construction set forth in claim 1 in which said member includesyieldable means carried by said member for ejecting a workpiece fromsaid work receiving openat said grinding station and positioned toengage a workpiece during the return movement of said work receivingopening so as yieldably to hold the workpiece in grinding position atsaid grinding station.

3. Apparatus for use in conjunction with a rotary grinding wheelcomprising a rotatable workpiece handling member having a work receivingopening rotatable in a ing tion to.a work grinding station and returnand having a radially projecting part to provide support for a workpiecethroughout the rotation of said work receiving opening from said workloading station to said work grinding station; means for supporting aworkpiece at said grinding station, said part assisting said worksupporting means in supporting a workpiece at said grinding station butbeing interrupted for a portion of its length so that durfor ejectinga-workpiece from saidwork'receiving opening at said grinding stationandpositioned to engage a workpiece supported at the grinding-stationduringreturn movement of saidmember so as yieldably to"hold"-a'-woi'k-- piecein grinding position at saidgrinding station.

"5. Apparatus for-use in conjunction with a-grin'ding wheel'comprising aframe; aworkpiece handling-member having a work receiving opening;-'means 'mounting said rncmber'on' saidframefor movement ofsaid'opening-in a substantiallyhorizontal planefroma-workpiece receivingstation to-a workpiece grinding station'a'ndreturn, said member havinga-workipiece-supporting'partfor supporting a workpiece throughout themovement df'saidopening from said receiving-station-to said grindingstation; means for supporting a workpiece atsaid grinding station, saidworkpiece supporting part assisting-said work supportingmeans insupporting a workpiece at said grinding station'but'being interruptedfor-aportion of its'length so that during a portion of'the returnmovement of said work-receiving opening 'a workpiece atsaid grindingstation is unsupported by said part and 'may beremovedfrom said grindingstation; and means carried bysaid frame'for moving said member.

6. The construction set forth-'in'claimiinwhich said member includesyieldable means carried by saidmember for ejecting a workpiece fromsaidwoi-kreceivingopening at said grinding station and positionedito engagea workpiece supported at the grinding station :during return movement ofsaid work receiving opening so-as yieldably to hold a workpiece ingrinding position -at-said grinding station.

7. Apparatus for use in conjunction with a grinding wheel comprising aframe; a platform; means mounting said platform on said frame; worksupporting means; means mounting said work supporting means on saidframe at a position spaced from said platform; a work handling memberhaving a workpiece receiving opening therein; means mounting said memberon said frame for movement of said opening in a substantially horizontalplane from a work loading station adjacent to said platform to a workgrinding station adjacent to said work supporting means and return, saidmember including a workpiece supporting part for supporting a workpiecethroughout the movement of said opening from said loading station tosaid grinding station and for assisting said work supporting means insupporting a workpiece at said grinding station during at least aportion of the return movement of said opening, said workpiecesupporting part being interrupted for a portion of its length so thatduring a portion of the return movement of said opening a workpiece atthe grinding station is unsupported by said part and may be removed fromthe grinding station; and means for moving said work handling member.

8. The construction set forth in claim 7 including means fortransferring a workpiece from said platform to said work handling memberwhen said opening is adjacent to said platform.

9. The construction set forth in claim 8 in which said transferringmeans comprises arm means having a cam surface thereon; means mountingsaid arm means on said frame for swinging movement thereof across saidplatform, and cam means carried by said work handling member in aposition to engage said cam surface and cause said arm means to swing.

'10. The construction set forth in claim 7 in which said member includesyieldable means carried by said member for ejecting 'a workpiece fromsaid work receiving opening at said grinding station and positioned toengage .a workpiece supported ..at the grinding. station '8 duringreturn-movement of said member so as yieldably to hold a workpieceingrinding-position at saidgrinding station.

1'1.'l1"he constructionset forth in claim 7 including meansfor-adjustingthe positions-of said work supporting-means and saidworkhandling member relatively to said frame and to each other.

'IZuGrindingapparatus comprising a frame; a grinding-wheeh-meansmounting said grinding wheelon'said frame; -'a platform means mountingsaid platform on said frame; work supporting 'means; means mountingsaid'work supporting means on-said frame at a position'space'd from saidplatform and adjacent to said grinding Wheel; a work handling memberhaving a workpiece receiving opening therein; means mounting said memberon said framefor movement of said opening in-a substantially horizontalplane from awork loading station adjacent'to said platform to a workgrinding station adjacent to saidwork supporting means and return, saidmember including a workpiece supporting part for supporting a workpiecethroughout the movement of said 'opening'from said loading station tosaid grinding station :a'n'ti for assisting said work supporting meansin supportinga workpieceat said grinding station during at least aportion of the return movement of said opening, said workpiecesupporting part being interrupted for a' portion of'itSLIengthsQ thatduring a portion of the return movement of said opening a workpiece ,atthe {station is .unsupportefd'by said part and may be removed from thegrinding .stationpand fmeansjfor movingsa'id work handling member.

"13."I he construction set forth in claim 12jincluding meansfontrans'ferring a workpiece 'from said. platform .to said workhandlingmember whensai'd opening is adjacent to 'sa'idplafform.

14. The construction set forth in claim 13 in which said transferringmeans comprises armimeanshaving -a cam surface thereon; means mountingsaid arm means on said fraiue'for swinging movement thereof acrossfsaidplatform, and cam means carried by-said workhandling member'in aposition to engage said cam surfacevand cause said arm'means to swing.

15. The construction set forth in claim 12 in which said member includesyieidaole means carried by saidmember for ejecting a workpiece from saidwork receiving opening vat said grinding station and positioned toengage a workpiece supported at the grinding station during returnmovement of said member so as yieldably to hold a workpiece in grindingposition at said grinding station.

16. The construction set forth in claim 12 including means for adjustingthe positions of said work supporting means and said work handlingmember relatively to said frame and to each other.

17. Apparatus for use in conjunction with a rotary grinding wheelcomprising a frame; a workpiece handling member on said frame having awork receiving opening movable in a substantially horizontal plane from.a work loading station to a.work grinding station and return and beingcapable of carrying a workpiece from said loading station to saidgrinding station; means on said frame for supporting a workpiece at saidgrinding station, said member havinga part for assisting said supportingmeans in supporting a workpiece at said grinding station, said partbeinginterrupted for a portion of its length so that during a portion of thereturn movement of saidwork receiving opening a workpiece at saidgrinding station is unsupported by said part and may be removed fromsaid grinding station; and means connected to said member for-mov-ing-the latter.

18. Apparatus for ,use in conjunction withaa grinding wheel comprising aframe; a -:w.ork handling member having ;a work receiving opening'thereinpmeansqnounting said member on said frameformovement ofvsaidwork receiving-opening from.arworkdoadingzstation; tosa :work

grinding station and return; a platform mounted on said frame andextending from said loading station to said grinding station forsupporting a workpiece at each station, said member having a part forassisting said platform in supporting a workpiece at said grindingstation, said part being recessed for a portion of its length so thatduring a portion of the return movement of said work receiving openingsaid recess receives a workpiece at the grinding station and removes ittherefrom; and means connected to said member for moving the latter.

References Cited in the file of this patent UNITED STATES PATENTS

